Path.is_file() swallows a missing entry but propagates EACCES. A
directory with read and no execute permission lists its names while
every stat under it raises, so one such folder in one booth raised out
of booth_items — and list_booths calls that for every booth, taking the
index down for all of them. The same blast radius as the
unrepresentable-filename case; the same posture applies: such an entry
is not a renderable file.
Predates R2 (identical on main before the merge); found while folding
R2's bug-hunt, where it made landed_at's per-entry skip unreachable.
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